AFAIK almost everything in 7.3 still supports 7.2-version abilities, so you should be fine. The required return type for stored procedures as triggers is different now: TRIGGER, instead of OPAQUE, but I think PostgreSQL 7.3 will be backwards-compatible with this for awhile.

Other than that, every ability in 7.3 is either an expanded version of what was in 7.2, or is an additional features, such as schemas and domains.

Thanks Rycamor. Your info is greatly appreciated. I haven't explicitly set any triggers in the database, so I should be fine. The purpose of the upgrade is to enable schema support, so I'm quite looking forward to it.

Not to mention the additional functionality in the alter table commands. MUCH nicer in 7.3 than 7.2.